@article{AMLG_1962__6_137764,
     author = {Hilary Putnam},
     title = {On {Families} of {Sets} represented in {Theories.}},
     journal = {Archiv f\"ur mathematische Logik und Grundlagenforschung},
     pages = {66--70},
     publisher = {mathdoc},
     volume = {6},
     year = {1962},
     zbl = {0126.02101},
     url = {http://geodesic.mathdoc.fr/item/AMLG_1962__6_137764/}
}